Steel EN24 Bright bar is a high-strength steel alloy that is hardened and tempered. The grade is a nickel-chromium-molybdenum alloy, which provides high tensile steel strength, good wear resistance, and flexibility. EN24 is suitable for many high-temperature applications due to its relatively excellent impact characteristics at low temperatures. 

EN24 sections larger than 250mm may still be accessible in the tempered and quenched condition, but a drop in mechanical properties may be noticeable near the center of the bar. It is thus suggested that larger sizes be supplied annealed (softened), with quenching and tempering performed after initial supply removal. This should result in improved mechanical properties toward the core.

Steel EN24 bright bars are available in various shapes, the most common of which is bright round bars, which are widely used in various industries. They have outstanding anti-corrosive qualities and, due to their shape, can be used in various applications.

Dhand Steels is the foremost EN24 bright round bright bar supplier, producing bright bars with advantageous mechanical properties such as great thickness, high tensile strength, and enhanced or improved corrosion resistance depending on the grade of steel used in their production. EN24 Round bright bars are highly durable due to their exceptional resistance to warping and wearing.

Application

EN24 was initially developed for use in the motorized vehicle and machine tool industry sectors for gears, pinion gears, shafts, spindles, and other similar components. Later, its applications became much broader. Suitable for producing parts for locomotives, rolling mills, cranes, coal-cutting machinery, and other applications requiring high strength and fatigue resistance. 

Other uses for EN24 include die bolsters, racks and pinion gears, angle pins for pressure die casting, hot stamping dies for aluminum stamping, die beds for steel stamping, lower temperature nut, bolt, and rivet heading dies, and significant section drop forging dies.

It is broadly used in the plastic and rubber molding industries for molds (especially rubber molds), patens, hob retaining rings, built-up mold retaining rings, and mold stop pins. EN24 is typically supplied hardened and tempered to T condition for molds. EN24 should be annealed and heat treated to the desired hardness if a higher hardness is desired.

Chemical Composition of EN24 bright bars

Manganese	0.45 – 0.70
Nickel	1.30 – 1.70
Silicon	0.10 – 0.35
Carbon	0.36 – 0.44
Phosphorus	Max 0.035
Chromium	1.00 – 1.40
Molybdenum	0.20 – 0.35
Sulphur	Max 0.040

Mechanical properties of E24 bright bars

Max Stress	850-1000 n/mm2
Elongation	13% Min	(9% if cold drawn)
0.2% Proof Stress	665 n/mm2 Min	Up to 150mm LRS
	635 n/mm2 Min	150 to 250mm LRS
Yield Stress	680 n/mm2 Min	Up to 150mm LRS
	654 n/mm2 Min	150 to 250mm LRS

Size Chart of EN24 Bright Bar

 

Type	SIZES (mm)	ISO Tolerance	SIZES (Inches)
Peeled and Polished	40.00 – 150.00	h11, h11-DIN 1013	1.50″ – 6.00″
Cold Drawn and Ground	10.00 – 75.00	h8-h9-h10-h11	5/6″ – 2.50″
Peeled and Ground	20.00 – 50.00	h9-h10-h11	3/4″ – 2.00″
Cold Drawn and Polish	3.00 – 75.00	h8-h9-h10-h11	1/8″ – 3.00″

 

EN24 Bar Physical Properties

Thermal conductivity at °C	W/(m*k)
40.5	20
25.5	700
32.5	350

 

Heat Treatment:

Because of aspects such as the size and shape of each steel component, heat treatment temperatures, such as rate of heating, cooling, and soaking times, will vary. Other factors to consider during the heat treatments include furnace type, quenching medium, and workpiece transfer facilities. 

Hardening:

EN24 is supplied heat treated and ready to use. If additional heat treatment is required, annealed EN24 should be slowly heated to 830-850°C and quenched in oil after sufficient soaking at this temperature. 

As soon as the tools reach room temperature, temper them. Scaling and decarburization can be reduced by hardening in a neutral salt bath. Heat to 830-850°C and then relax in oil after equalization.

Tempering:

Heat carefully to an appropriate temperature determined by a tempering table or chart, soak at the temp for 2 hours per 25mm of the ruling section, and excellent in the air. Tempering between 250-375°C is not recommended because it will significantly reduce the impact value. 

The tempering temperature is determined by the mechanical properties required; the steel can accomplish EN24U, EN24V, EN24Y, EN24W, and EN24Z.

Reliving Stress:

When parts are strongly machined, ground, or otherwise subjected to hard work, stress relieving before hardening is recommended. Heat to 650-670°C and soak thoroughly before cooling in the furnace or the air.

Normalizing:

1. Normalizing temperature: 840-900°C.
2. Keep the temperature stable for several hours.
3. The air is cooling.

Annealing:

Heat slowly to 840-860°C, soak thoroughly, and cool with the furnace to 580°C before removing.

 

Our organization is an ISO 9001:2015 ensured brilliant bar producer, exhibiting the unrivaled nature of the relative multitude of stocks it produces. To ensure that its items are protected with utilization, the organization likewise complies with extra security guidelines including HACCP.

Supply Range of EN-24 Steel 

EN24 steel is available in various shapes to meet your different demand or projects:

• EN24 Round Bar: Diameter ranges from 16mm to 600mm
• EN24 Plate: Available in thicknesses from 10mm to 200mm
• Length: standard length 6 meters or random length
• Condition: As rolled,  annealed or Q+T hardened condition
• Surface: black surface or machined peeled surface

BS EN 24 Specifications and Equivalent Steel Grades

Country	Britain	USA	Britain	Japan
Standard	BS 970	ASTM A29	EN 10250	JIS G4103
Grades	EN24 / 817M40	4340	34CrNiMo6	SNCM 439/SNCM8

EN 24 Steel Chemical Composition

Grade	C	Mn	P	S	Si	Ni	Cr	Mo
EN24/817M40	0.36-0.44	0.45-0.70	0.035	0.040	0.1-0.40	1.3-1.7	1.00-1.40	0.20-0.35
4340	0.38-0.43	0.60-0.80	≦0.035	≦0.04	0.15-0.35	1.65-2.00	0.70-0.90	0.20-0.30
34CrNiMo6/ 1.6582	0.30-0.38	0.50-0.80	≦0.035	≦0.035	≦0.40	1.3-1.7	1.3-1.7	0.15-0.30

EN24 Steel Properties

EN24 steel is characterized by:

• High tensile strength and toughness.
• Good ductility and impact resistance.
• Excellent wear resistance.
• Enhanced strength and durability post-heat treatment.

Mechanical Properties (subject to ruling section)
Condition	Tensile N/mm²	Yield N/mm²	Elongation %	Izod KCV J	Hardness Brinell
T	850-1000	650	13	35	248-302
U	925-1000	755	12	42	269-331
V	1000-1150	850	12	42	293-352
W	1075-1225	940	11	35	311-375
X	1150-1300	1020	10	28	341-401
Y	1225-1375	1095	10	21	363-429
Z	1550	1235	5	9	444

Forging of EN24 Steel

Forging EN24 involves heating it to 850°C – 1200°C, ensuring uniformity in temperature before shaping. This process enhances its mechanical properties, and make it more suitable for precision applications. Proper cooling post-forging is crucial to avoid any potential brittleness.

Heat Treatment of EN24 Steel

Heat treatments like annealing, normalizing, quenching, and tempering play a significant role in optimizing EN24’s properties:

Hardening EN24 Steel: heat the EN24 up to a temperature between 823°C and 850°C. Make sure it’s heated right through. After that, it’s time for quenching in oil. This step is important to harden the EN 24 steel properly.

Tempering the Steel: Once you’re done with hardening, the next step is tempering. You’ve got to heat it uniformly, really thoroughly, to your chosen tempering temperature. The maximum you should go for is 660°C. Now, here’s the key part: hold that temperature steady for about two hours for every inch of the steel’s total thickness. Oh, and a heads-up – try to avoid tempering between 250°C and 375°C. Tempering in this range can really weaken the steel’s impact strength.

Stress Relieving: After all that hard work, the steel could use some stress relief. Slowly heat it to a temperature between 650°C and 670°C, and make sure it soaks in all that heat well. Once done, you can cool down the EN24 either in a furnace or just let it cool in the air. This step helps in reducing any stresses that might have built up during the hardening and tempering processes.

Applications of EN24 Steel

EN24’s versatility allows its use in diverse sectors:

• Automotive: Axles, gears, and shafts.
• Aerospace: Highly stressed components.
• Tooling: High strength machine parts.